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(No Model.) 2 Sheets-Sheet 1 0. STEINLE.

GAPILLARY MANOMETER. I NO. 537,588. Patented Apr. 16, 1895.;

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NITED STATES FFICE.

PATENT OTTO STEINLE, OF QUEDLINBURG, GERMANY.

CAPILLARY MANOMETER.

SPECIFICATION forming part of Letters Patent No. 537,588, dated April 16, .1895.

Application filed fieptember 28,1894. Serial No. 524.408. (N model.)

To ctZZ whom it may concern.-

Be it known that I, Orro STEINLE, a subject ofthe King of Prussia, German Emperor, and a resident of Quedlinburg, in the Province of Saxony, German Empire, have invented certain new and useful Improvements in Capillary Manometers, of which the following is an exact specification.

Hitherto it has not been possible to employ the coiled capillary tubes filled with mercury-such as are known in thermometersin manometers, as the steam on pressing the mercury into the capillary channel would enter itself the latter, and wouldintroduoe dirt into, or cause rusting of, the said channel.-

The object of my invention, therefore, is to obviate the said disadvantages, which I attain by combining with the manometer proper a small reservoir containing mercury, and having such a position, that the steam cannot but press upon the surface of the mercury within said reservoir, without being able to enter the capillary channel of the coiled tube.

In order that my invention may be more readily understood, I refer to the accompanying drawings, in which- Figure 1 is an elevation of my improved manometer. Fig. 2 is a sectional View of the same. Fig. 3 is an elevation of a slightly modified manometer. Fig. 4 is a sectional view of the same. Fig. 5 is an elevation of another modification, and Fig. 6 is a sectional view of the latter.

Similarletters denote similar parts throughout thedifferent views.

Referring to Figs. 1 and 2, a is the capillary coiled tube arranged within the Well known gage-case p, and having at its closed outer end a the hand I) riveted thereon. Z) is the scale. The inner end of the capillary channel terminates into a plug q havinga central bore a communicating with the reservoir 0 through the hole a The steam enters the manometer through the channel d. The reservoir c is filled with mercury to such aheight only, that the mouth of channel cl is always above the level of the mercury. The mer cury is entirely prevented from entering said channel, even if the manometer during transport is inclined. It will be seen, that the steam can press upon the surface only of the mercury within the reservoir 0, without being able to enter the channel of the coiled capillary tube.

In Figs. 3 and 4, the above described arrangement is essentially the same. The hand 17, however, is not directly attached to the tube a. To the closed end or of the tube is attached, by means of a joint, the rod e, the other end of which is connected by a joint with the piece f, which latter is adapted to be displaced along the rod h. The set-screw 78 serves for fixing piece f upon the rod h. The latter is pivoted at Z, and is furnished with a toothed sector at gearing with a small toothed wheel m rigidly attached to the hand 19, or to the shaft of the same respectively.

In Figs. 5 and 6, the rod e is hinged to a piece 25 fixed upon the spindle n by means of the set-screw o. The spindle n carries the hand 1).

Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States is In a manometer, the combination with a coiled capillary tube filled with mercury of a mercury-reservoir constantly communicating with said tube, the mercury contained Within said reservoir being adapted to receive, and to transmit, the pressure of the steam,for the purpose as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

OTTO STEINLE.

Witnesses:

JULIUs MUTH, CARL WUERT. 

